RAR archive of 9.01 MB for the ASUS X507UBR mainboard, revision 2.0. The name does not say whether it contains a schematic, a boardview, a BIOS dump or a mix, so extract it and check the contents. ASUS laptop boards carry their model code and revision on the PCB, and the REV 2.0 marking must match before you trust component placement or rail names. Material of this kind is used to follow power sequencing, locate test points, find shorts on the main rails and, where firmware is included, reprogram the SPI chip.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @SCHEMATICWORLD. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.